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Table 2 Different studies comparing the slow preservation and/or vitrification of day 5 and day 6 blastocysts in terms of survival after warming, implantation and pregnancy rates

From: Factors affecting the outcome of human blastocyst vitrification

  Slowly frozen Day 5 Blastocysts Slowly frozen Day 6 Blastocysts Vitrified Day 5 Blastocysts Vitrified Day 6 Blastocysts
Mukaida et al. 2003[9]    Survival 87% Survival 55%
Stehlik et al. 2005[12] Survival 83.1%
Pregnancy rate 16.7%
Survival 89.5%
Pregnancy rate 18.5%
Survival 100%
Pregnancy rate 50%
Survival 100%
Pregnancy rate 33%
Liebermann & Tucker 2006[13] Survival 91.4%
Implantation 29.6%
Pregnancy rate 42.8%
Survival 94.8%
Implantation 28.2%
Pregnancy rate 43.1%
Survival 95.9%
Implantation 33.4%
Pregnancy 48.7%
Survival 97.5%
Implantation 25.9%
Pregnancy 42.8%
Kader et al. 2008[36] DNA integrity index: 94.76% ± 4.70 DNA integrity index: 90.87% ± 6.16 DNA integrity index: 84.36% ± 8.76 DNA integrity index: 77.61% ± 16.65